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annotate target-utils/libc/memcmp.S @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +0000
parents a675cec34076
children
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a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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1 .text
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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2 .code 32
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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3 .globl bcmp
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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4 .globl memcmp
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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5 bcmp:
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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6 memcmp:
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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7 cmp r2, #0
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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8 beq zero_len_out
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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9 mov r3, r0
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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10 1: ldrb r0, [r3], #1
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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11 ldrb r12, [r1], #1
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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12 subs r0, r0, r12
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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13 bxne lr
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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14 subs r2, r2, #1
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
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15 bne 1b
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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16 bx lr
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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17
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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18 zero_len_out:
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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19 mov r0, #0
a675cec34076 target-utils/libc: assembly implementation of bcmp/memcmp
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20 bx lr